$\frac{2x}{x+3}\ge1$
$\lim_{x\to0}\left(\frac{12sinx}{x}\right)$
$f\left(x\right)=x^3\left(3x^4-1\right)^5$
$7+6\:.\:2-8\::\:\left(-4\right)+3\:-5\:$
$\left(b+2f\right)\left(b^2-2bf+f^2\right)$
$-3.84i-9i$
$y=\frac{\left(x^2+3x-4\right)}{e^{2x}}$
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